New features available for dcc.Loading

[AnnMarieW]

Which package?

vizro

What's the problem this feature will solve?

Hi Vizro team :wave:

I just wanted to let you know about some cool new features available for dcc.Loading in dash 2.17.0

It's now possible to:

• Delay showing the spinner for a specified number of milliseconds - which eliminates the flickering when the loading time is very short.
• Make the background visible and customizable with CSS -- like adding blur or opacity. This makes the transition between loading and ready a lot smoother.
• Use your own custom spinner rather than the built-in spinners provided.

You can find the new features in the dcc.Loading section of the dash docs.

I'll do a draft PR to apply a few new settings, and you can check it out by running the demo app. If you are interested in adding this, I'd be happy to help fine-tune it.

Describe the solution you'd like

As described above

Alternative Solutions

None

Additional context

None

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